In accordance with a particular embodiment of the present invention, a method for providing privacy protection to network users includes receiving a subscription request from a first end user. The subscription request identifies a second end user for whom the first end user would like to become a registered...http://www.google.com.tw/patents/US7920847?utm_source=gb-gplus-share專利 US7920847 - Method and system to protect the privacy of presence information for network users
